Think about adding different variables for different versions of ie

[kizu]

We could use more conditional comments to differentiate the code for different versions of ie. What we could do with that? Do we need to support ie9 this way? What hacks and extra mixins could we add to support different versions of ie?

[kizu]

Instead of different variables we could just place the number of IE in the ie variable, so it would still work as boolean and we also would get the ability to do some number comparisons like if ie > 6 etc.